UID Changeable RFID 13.56mHz IC Wristband Tags Block 0 Sector Writable (Pack of 2) Go to amazon.com Related posts How to buy the best 13.56 rfid ic? Featureuid changeable wristband Description1.mf1 s50 chip 2.uid changeable,block 0 writable. 3.silicone material. 4.color: orange and black. 5.pack of 2